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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural characterization of the aged Inconel 718
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Structural characterization of the aged Inconel 718

机译：老化的Inconel 718的结构特征

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The aging of the NC 19 Fe Nb alloy (Inconel 718), previously quenched from 990 deg C, is characterized by X-ray diffraction, transmission electron microscopy and micro-hardness investigation. The X-ray diffraction patterns reveal the co-existence of the simple cubic, the tetragonal and the orthorhombic structures. These structures correspond respectively to the #gamma#', #gamma#", and #delat# phases. A detailed study of each XRD pattern gives the lattice parameter and the crystalline grain size of the existing phases. TEM observations on thin foils have led to identification of the different phases responsible for the various hardening stages occurring during isothermal tempering performed at 680 and 750 deg C temperatures for 4, 50 and 100 h. The #gamma#' and #gamma#" phase precipitation are strongly dependent on the aging temperature and time. For 680 deg C aging temperature, hardness investigations show that a first hardening (HV=450) occurs when the duration is about 4 h (the #gamma#' particle size given by TEM observation is about 5-6 nm). A second hardening (HV=500) was shown to occur at 50 h. It corresponds to the precipitation of the #gamma#" phase perfectly coherent with the y matrix. For 750 deg C aging temperature, the #gamma#" phase precipitation (coherent with the matrix and the disc shaped with a length of 30 nm) produces a fast hardening after 4 h (HV=466). For a longer thermal exposure, the orthorhombic 8 phase appears, reaching a high grain size and fraction volume after 100 h and leading to a drastic microhardness decrease. From 30 nm on, the tetragonal distortion of the #gamma#" particles increases with increasing precipitate size.
机译：NC 19 Fe Nb合金（Inconel 718）的时效是从X射线衍射，透射电子显微镜和显微硬度研究中得出的，该合金先前是从990℃淬火的。 X射线衍射图揭示了简单的立方，四方和正交结构的共存。这些结构分别对应于#gamma＃'，＃gamma＃“和＃delat＃相。对每种XRD图案的详细研究给出了现有相的晶格参数和晶粒尺寸。以确定在680和750摄氏度的温度下进行4、50和100小时的等温回火过程中发生的各个硬化阶段的不同相。温度和时间。对于680℃的时效温度，硬度研究表明，当持续时间约为4小时（通过TEM观察得出的＃gamma＃'粒径约为5-6 nm）时，就会发生第一次硬化（HV = 450）。显示在50 h发生第二次硬化（HV = 500）。它对应于与y矩阵完全相干的＃gamma＃“相的析出。在750℃的时效温度下，产生＃gamma＃”相沉淀（与基体和形状为30 nm的圆盘相干） 4小时后快速硬化（HV = 466）。对于更长的热暴露时间，出现了正交晶8相，在100小时后达到了高晶粒度和分数体积，导致显微硬度急剧下降。从30 nm开始，“＃γ＃”颗粒的四方畸变随着沉淀物尺寸的增加而增加。

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